Logic Masters Deutschland e.V.

This puzzle was set for the CTC Discord's June monthly puzzle prompt of "Pathfinding."

• Normal sudoku rules apply: Place the digits 1-9 once each in every row, column and 3x3 box.
• Each cell in the grid is a building. A building's height is defined by the digit it contains. King Kong has captured an innocent person in Row 1 Column 1 and is attempting to make his way to the top of the Empire State Building in Row 9 Column 9. The path he takes through the city moves orthogonally, and never touches itself, not even diagonally. King Kong can only jump to buildings that are 1 higher or 1 lower than the building he is currently on.
• Digits outside the grid give the number of buildings that could be seen from that position looking into the grid. Taller buildings hide shorter buildings.
• A circle is on King Kong's path, and the building in that cell must be taller than the buildings immediately before and after that building on the path.
• Several biplanes are attempting to shoot down King Kong. King Kong never visits cells with biplanes in them. A digit on a biplane indicates the distance to the closest building on the path in the direction the biplane is pointing.

Solve in SudokuPad